Testing-machine.



H. l. CHEW. TESTING MACHINE. APPLICATION man MAY a. 191s.

ru: NoRRzs Pera-Rs co., wAsHmcroN. n. c4

H. I. CHEW. TESTING MACHINE. APPLICATION FILED MAY a. I9I3.

v 1,208,748. Patented Dec. 19,1916.

, 6 2 SHEETS-SHEET 2- 65W 2- HARRY I. CHEW, OF WASHINGTON, DISTRICT 0F COLUMBIA, ASSIGNOR 0F ONE-HALF TO .ALFRED D. TREIVIPE, 0F UTICA, NEW YORK.

TESTING-MACHIN E.

Specicaton of Letters Patent.

Patented Dec. 19, 1916.

To all whom t may concern.-

Be it known that I, HARRY. I. CHEW, a citizen of the United States of America, residing at Washington, District of Columbia, have invented certain new and useful Improvements in Testing-Machines, of which the following is a specification.

The present invention relates to machines for testing materials, and especially to machines for testing the ductility of bituminous materials and has for its purpose to provide a machine of that character which will be positive and accurate in operation, and one embodying the minimum amount of mechamsm.

The invention has for its further purpose to provide a testing machine wherein the driving mechanism for the carriage is connected and so located with respect thereto that the material beingv acted on will be subjected to more accurate testing than has heretofore been obtained in machines for this purpose. And it is further'proposed to provide a machine wherein the carrlage driving mechanism will permit of the carriage being readily disconnected and returned to initial position at the will of the operator.

With these and other objects in view the invention consists in the novel details of construction and combination of parts more fully hereinafter described and particularly pointed out in the claims. Referring to the drawings, forming a part of this specification, in which hke figures designate like parts in the several views, Figure 1 is a top plan view of the testingmachine. Fig. 2 is an end elevational view thereof, showing the driving motor for the carriage. Fig. 3 is a transverse sectional view of the machine and showing the carriage in elevation. Fig. 4 is a detail in section of the connection between the carriage and the driving shaft, and; Fig. 5 is a detailed, perspective view of the mold for the material to be tested.

Referring to the construction in further detail the machine consists of a tank formed of side members 1 and 2, end members 3 and 4, and a bottom member 5. The tank is constructed preferably of alberine stone which has been found to be the most appropriate material. A pair of tracks 7 and 8 are mounted on the opposite inner side walls of the tank to support the carriage 6 and to which end said carriage is grooved as at 9 to engage the track 7 and has a tongue 11 iitting within a channel-way 10 formed in the track 8. A plate 12 is secured to the carriage 6 immediately beneath the track 8 and 1s adapted to engage therewith and prevent the carriage from becoming displaced.

A pair of plates or shelves 13 and 14 are mounted on the end member V3 of the tank and the carriage 6 through the medium of bolts 15 and a connecting plate 16 respectively. The two plates 13 and 14 have mounted thereon the end pieces 17 and 18 of the mold or frame (see Fig. 5) and said pieces are secured in position thereon by bolts or pins passing through lugs 19 and the plates as shown in Fig. 1. A pair of detachable members 20 are removably connected to the mold parts 17 and 18 through the medium of tongues 21 that engage within grooves formed in said members 17 and 18. The mold is adapted to receive the material to be tested while the same is in a liquid state, and is held therein submerged in the Water contained in the tank until it has suiiiciently solidified or become plastic to the degree required for the testing operation. At this time the side members 20 are removed when the carriage is ready to be driven as will be understood.

The carriage driving mechanism consists of a screw shaft 22 j ournaled in the bearing 23 in the end wall 3 and at its opposite end is journaled in a bushing 24 tted in the tank wall 4. A nut 24a is mounted on the bushing 24 and secures the same in position together with the bushing head 27. A collar 25 is xed to the shaft by a taper pin 26 and holds the shaft against lateral displacement.

The carriage is connected to be driven by the shaft 22 through the medium of the form of device shown in Fig. 4. A tubular part 28 is formed on the carriage and has connected thereto a cylinder 29 closed by a cap 30. A half-nut 31 is movably mounted in the cylinder 29 and moves to engage the shaft 22 normally under the action of a spring 32. A lever 33 is pivotally connected with the member 3l at the point 34 and is adapted for withdrawing said member 3l from engagement with the screw shaft 22. Thefcarriage is connected with the shaft for stretching the material and at any time may be readily disconnected and returned to its initial position without requiring the driving motor to be stopped. The member 28 serves as a support for the screw shaft 22 and prevents sagging thereof, and avoids relative displacement between the shaft and supporting member; and the part 28 also acts as a bearing for the screw shaft.

lIhe shaft 22 is adapted to be rotated by the motor 34a having a shaft 35 on which is mounted a screw 37 engaging with the worm wheel or `pinion V38. The journal box or casing 36 is secured to the tank wall et and has mounted therein to rotate said shaft 35. The motor is provided with a rheostat 39 having the usual controlling handle 40 for regulating the speed 'of the motor after the usual manner. Y 'Ihe casing of the motor 3la is mounted on the tank through the medium of the angle plate tl which is secured to said motor casing and the tank through the medium of bolts 4:2 and 43 respectively. A lgage all is mounted on the tank and adapted to be adjustably positioned thereon through the medium of screws 45 liXedly mounted on the tank and passing through slots t6 (as shown in Fig. l) and jam nuts 45 ou said screws 45. A pointer 47 is mounted on the carriage and coperates with the scale of the gage as will be readily understood.

It is proposed that all metal parts of the machine which are exposed to water be made of brass, and that the same be accurately machined and fitted. The machine when constructed in accordance with the foregoing will run with practically no vibration, and thus avoid the possibility of snappingV the line thread of bituminous material before the test is properly completed. The carriage may be readily thrown out of driving engagement with the screw and instantly shifted or returned by hand to position for making a new test, thus effecting greater convenience and considerable saving of time.

VThere is furthermore provision made for from one to three tests at the same time to which end the shelves or plates for holding the mold or form are adapted as shown clearly in Fig. l.

The-material in the molds or forms under test `is at all ,times held true or in equilibrium as regards the fixed and moving lmold sections, sincet'he carriage 6 has a relatively long` bearing on the track '8, which is the essential supporting or foundation track for the moving carriage.

It is obvious that those Askilled in the art may vary the details of construction and arrangement of parts, withoutdeparting from the spirit of'my invention, and therefore I do not wish to be limited to suchY features except as may be required by the claims.

` What I claim as new is:` Y

l. In a testing` machine the combination of a tank; a carriage mounted to travel on the tank; a screw Vshaft journaled in the tank; a member carried by said `carriage and movable into and out of Vengagementwith the threaded shaft 'whereby to drive the carriage and permit vof shifting thereof; moldsections mounted on 'said' carriage and tank re- Y spectively and means for operating the screw shaft, substantially as described.

2. In a testing machine the combination y of a tank; a pair of guides mounted gon the tank; a carriage'mounted'to travel on said guides; a screw shaft journa-ledin the tank; a threaded member carried by said carriage and movable into and out of-engagement' with the threaded shaft whereby to drive Vthe carriage and permit of shifting thereof;

members mounted on said tank and carriage for holding the respectivelends of the material being tested; and means -for operating the screw shaft. Y Y Y 3. In a testing machine vthe combination of a tank; a pair of `guides Vmounted in the Y tan'k; a carriage mounted to travel on said guides; a screw shaft journaled inthe tank vand having driving connection with said carriage; members mounted on said tank and carriage for holding the respective ends ofthe material being tested; a screw and worm gear connected to the screw shaft; and a motor connected to drive said gear.

4. In a testing machine the combination of a tank; guides mounted in the tank; a carriage mounted to travel on said guides;

a screw shaft journaled in the tank and'.

adapted to drive said carriage; means/for throwing said carriage into and/out of driving engagement; a scale mounted oii the tank; a pointer carried by the carriage and adapted to drive the carriage; a plateV mounted on the tank; la plate mountedV on 'the carriage; memberslcarried 'by said plates for holding the respective ends of the material being tested; a scale Vmounted yon Vthe tank; `a pointer carried by the carriage and coperable with the scale; anda Vmotor for operating saidfscrew shaft. Y Y

6. In a testingmachinetheicombiiiation of.

a supporting structure; guide rails mounted nected to the screw shaft; and means for on said structure; a carriage mounted to operating said screw shaft. 10

travel on said guide rails; a screw shaft In testimony whereof I affix my signature journaled on said structure and having drivin presence of tWo Witnesses.

'5 ing connection with said carriage; members HARRY I. CII-IEW.

mounted on said structure and carriage for Witnesses: holding the respective ends of the material LESLIE W. TEILER, being tested; a screw and Worm gear con- THoMAs H. MGKEE.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D G. 

